And [Ibrahim's (Abraham)] invoking (of Allah) for his father's forgiveness was only because of a promise he [Ibrahim (Abraham)] had made to him (his father). But when it became clear to him [Ibrahim (Abraham)] that he (his father) is an enemy to Allah, he dissociated himself from him. Verily Ibrahim (Abraham) was Al-Awwah (has fifteen different meanings but the correct one seems to be that he used to invoke Allah with humility, glorify Him and remember Him much), and was forbearing. (Tafsir Al-Qurtubi).
और इबराहीम का अपने बाप के लिए मग़फिरत की दुआ माँगना सिर्फ इस वायदे की वजह से था जो उन्होंने अपने बाप से कर लिया था फिर जब उनको मालूम हो गया कि वह यक़ीनी ख़ुदा का दुश्मन है तो उससे बेज़ार हो गए, बेशक इबराहीम यक़ीनन बड़े दर्दमन्द बुर्दबार (सहन करने वाले) थे